--------------------
- Search for s-channel single top-quark production in proton-proton collisions at $\sqrt{s}$=8 TeV with the ATLAS detector doi link

Auteur(s): Aad G., Alio L., Barbero M., Bertella C., C. Clémens J., Coadou Y., Diglio S., Djama F., Feligioni L., Hoffmann D., Hubaut F., B. F. G. Knoops E., Le Guirriec E., Li B., Madaffari D., Mochizuki K., Monnier E., Muanza S., Nagai Y., Pralavorio P., Rozanov A., Serre T., Talby M., Tiouchichine E., Tisserant S., Toth J., Touchard F., Ughetto M., Vacavant L., Boumediene D.

(Article) Publié: Physics Letters B, vol. 740 p.118-136 (2015)
Texte intégral en Openaccess : arXiv


Ref Arxiv: 1410.0647
DOI: 10.1016/j.physletb.2014.11.042
WoS: 000347046200017
Ref. & Cit.: NASA ADS
15 Citations
Résumé:

This Letter presents a search at the LHC for s-channel single top-quark production in proton-proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb$^{-1}$. Selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event classifier based on boosted decision trees is developed to discriminate s-channel single top-quark events from the main background contributions. The signal extraction is based on a binned maximum-likelihood fit of the output classifier distribution. The analysis leads to an upper limit on the s-channel single top-quark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of $\sigma_s$=5.0$\pm$4.3 pb, consistent with the Standard Model expectation.



Commentaires: 10 pages plus author list plus cover page (26 pages total), 3 figures, 2 tables, submitted to Phys. Lett. B. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2014-03/ ; See paper for full list of authors